What level of vertical protection does the ROC provide during obstacle clearance?

The ROC, or Required Obstacle Clearance, provides high-level vertical protection during obstacle clearance because it ensures that aircraft maintain a safe altitude above obstacles within a specified area. This is crucial in flight operations, particularly during takeoff and landing phases, where terrain and obstacles present a significant risk. High-level protection minimizes the chance of collision with these obstacles by establishing a buffer between the aircraft's altitude and any potential hazards.

This protection is critical for maintaining safety margins, especially in areas where terrain might vary unexpectedly or where obstacles may not be immediately visible. By ensuring that aircraft are operating at altitudes that exceed the heights of surrounding obstacles, the ROC contributes to overall flight safety, especially in environments with significant topographical variations or numerous obstacles.